Revert "Remove `/tests` from express middleware in favor of `ember test --server`."

This reverts commit 02fee9e96391ac70910b289af81fae3be0af8942.
Merge pull request #477 from rjackson/revert-test-removal

Revert "Remove `/tests` from express middleware in favor of `ember test --server`."
Update Ember version.
Merge pull request #481 from nathanhammond/patch-1

Update Ember version.
Add JSHinting.
Fixup JSHint errors in newly generated app.
Merge pull request #482 from rjackson/add-jshinting

Add JSHinting.